Colombo Weather in May
Colombo in May averages 31°C (88°F) during the day and 26°C (79°F) at night. May is part of the rainy season, so frequent rainfall is typical.
Rainfall in Colombo in May
As part of the rainy season, Colombo sees around 14 days of rain in May, with an average of 294 mm (12 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.
Temperature in Colombo in May
If you're visiting Colombo in May, expect highs of 31°C (88°F) and overnight lows around 26°C (79°F). It's usually most comfortable outside during the morning and later in the day. Nights are warm at 26°C (79°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Colombo in May
There are approximately 202 hours of sunshine this month, despite being the rainy season. Rain often arrives in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, it could still be a nice time to visit.
Wind Speed in Colombo in May
May sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.
Average water temperature in May
The water is 28°C (82°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January typically offers the best weather for Colombo.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Colombo's climate page.
Colombo Temperature in May
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Water Temperature
28°C (82°F)
Chance of Rain
46%
Precipitation
294 mm (12 in)
Rainy days
14 days
Humidity
77%
Windspeed
2 m/s (4 knots)
Sunshine
202 hours
Percentage Sunshine
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in Colombo typically stay consistent throughout May, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in May
Daily Historical Precipitation
44-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Colombo in May
Browse day-by-day weather records for Colombo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Colombo historical weather extremes in May
The extremes listed below come from historical weather data collected in Colombo from 1995 through 2026.
- The warmest day in May was on May 29, 1998, with a maximum of 37°C (99°F).
- Colombo experienced its chilliest May day on May 7, 1997, reaching only 25°C (77°F).
- Nighttime temperatures dropped to 20°C (68°F) on May 13, 2003, marking the coldest May night on record.
Best Places in Sri Lanka in May
Find out more about the weather in Sri Lanka and which places have the best travel conditions in this month. See all of Sri Lanka in May →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Colombo in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Colombo in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Colombo's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Colombo climate overview or explore weather in Sri Lanka.
